Air humidifier



FIG. 1 is a front, top and right-side perspective view of an air humidifier showing my new design;

FIG. 2 is a front view thereof;

FIG. 3 is a rear view thereof;

FIG. 4 is a top view thereof;

FIG. 5 is a bottom view thereof;

FIG. 6 is a right-side view thereof; and,

FIG. 7 is a left-side view thereof.

The broken lines shown represent unclaimed subject matter of the air humidifier and form no part of the claimed design. 

CLAIM The ornamental design for an air humidifier, as shown and described. 